Hardness Tester Thermal Force Correction
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Solution Overview
Problem
Conventional hardness testers experience a reduction in test force due to heat generated in the test force applier, particularly when applying large forces, leading to inaccurate measurements.
Innovation Solution
A hardness tester that includes a test force applier using electromagnetic force, a temperature detector, and a test force corrector to adjust the applied force based on detected temperature, utilizing a correction table to maintain precise force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electromagnetic force is employed to apply test force to the indenter, then selection of desired test force is enabled, but heat is generated in the test force applier causing reduction in test force
Solution Approach 1:
The patent implements a feedback mechanism where a temperature detector continuously monitors the temperature of the test force applier. Based on the detected temperature, a test force corrector automatically adjusts the test force by modifying the current supplied to the coil, compensating for the force reduction caused by heat generation. This closed-loop feedback system maintains accurate test force application despite thermal effects.
Solution Approach 2:
The patent changes the electrical parameter (current) supplied to the coil based on temperature conditions. When temperature increases causing force reduction, the system increases the current to compensate and maintain the desired test force. This dynamic parameter adjustment ensures consistent test force application across varying thermal states.
2Force
If large test force is generated, then hardness measurement capability is improved, but excessive heat is generated in the test force applier leading to substantial reduction in test force
Solution Approach 1:
The temperature feedback mechanism continuously monitors thermal conditions in the test force applier and automatically adjusts the current supply to the coil. When large test forces cause excessive heat generation and force reduction, the system detects the temperature increase and compensates by adjusting the electrical parameters, maintaining accurate test force application even under high-load conditions.
Solution Approach 2:
The system dynamically changes the electrical current parameter based on temperature conditions. During large test force application where heat generation is significant, the system adjusts the current magnitude and timing to compensate for thermal effects, ensuring the actual test force remains accurate despite temperature increases in the applier.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively corrects for reductions in test force caused by heat, ensuring highly precise force application and minimizing errors in hardness measurements.
Implementation Method 1
a test force applier generating the test force using an electromagnetic force generated by supplying a current to a drive coil provided in a magnetic field
Implementation Method 2
a temperature detector detecting a temperature of the test force applier
Data Source
AI summary
A hardness tester has a test force applier generating a test force using an electromagnetic force generated by supplying a current to a drive coil provided in a magnetic field and applies the test force to an indenter to press the indenter into a surface of a sample; a temperature detector detecting a temperature of the test force applier; and a test force corrector correcting the test force generated from the test force applier based on the temperature detected by the temperature detector.